Alibie

Cheat codes
Hit the ENTER key and key in the code
Cheat Effect
X marks the spot Reveals map (fog of war still there)
Medium Rare Please Gives 10,000 food
Give me liberty or give me coin Gives 10,000 coin
Nova & Orion Gives 10,000 XP
A recent study indicated that 100% of herdables are obese Fattens all animals on map
Speed always wins Turns on 100x gather/build rates
Sooo Good Turn on “Musketeer’ed!” when you get killed by Musketeers
Ya gotta make do with what ya got Spawns the Mediocre Bombard at your Home City gather point
Gives 10,000 wood
this is too hard Win in singleplayer
tuck tuck tuck Spawns a big red monster truck that can run over anything
Shiver me Timpers! Destroys all the enemy boats on the map
Where's that axe? George Crushington
Get 10,000 Wood

• Unlimited Resources
Use a text editor to edit the "proto.xml" file in the "data" directory in the game folder. Note: You may first need to uncheck the "Read Only" attribute of that file's properties in Windows Explorer. Search for the text "CrateOf". You will find CrateofFood, CrateofCoin, CrateofWood, CrateofFoodLarge, CrafteofCoinLarge, and CrateofWoodLarge. For all these entries, find the tag "InitialResourceCount" and change the count to whatever desired. For example, the normal crates each have "100.000" of the resources. You can change the "100" to "99999.000", etc.
• Easy Leveling in Single Player
Open the sp_yourcityname_homecity.xml file in the My Documents\My Games\Age of Empires 3\Savegame (dont forget to make a back up first) folder, search for .
You will see something like this xx, put in 99 for the xx, save the file, go into the game and play a skirmish. Now you are level 99 !
• Unlimited Unlock Points in Single player
Open the sp_yourcityname_homecity.xml file located in \My Documents\My Games\Age of Empires 3\Savegame (dont forget to make a backup of this file) find this line .
The line should look like this xx, where x is the number of skillpoints you currently have. Change the xx to a high number such as 999, save the file and start Age of Empires 3. Go into a skirmish game, go to manage your city and you will now have 999 unlock points to unlock various things for your city.
• Access Hidden Units in Editor
There are several secret units that don't, at the moment of this writing, have a code to access them during games. Despite this, they can still be accessed in the editor through a simple process. First, place a unit on the map, then select the "Replace Unit" command under "Objects." In the drop down menu, select Fluffy, Flying Purple Tapir, Learicorn, George Crushington, Lazerbear, or Monster Truck A and then click replace unit

What is your current lvl?
Anyways the link below will provide detailed information regarding quests,
scroll down to the bottom of the page for Quest Summary
(will let u know the efficiency of each quest):
http://thecoffeespoon.net/battlestations/quests

From my own experience:

lvl 10 - 15 Escort a trading Merchant - Imperial
(will stop once Follow the path of Captain Jack is unlocked)

lvl 15 - 25 Scout the Azure Coast - Jade
(stop once City of Sand is unlocked)

lvl 25 - 30 Join Desert Raid - Amraan
(unlock Poach Dune Mantas)

lvl 30 - 35 Poach Dune Mantas - Amraan
(unlock Clear out a Giant Nautilus Nest)

lvl 35 - 40 Smuggle Rum - Corxas
(unlock Attack Black Bandits)

lvl 40 - 50 Attack Black Bandits - Corxas
(unlock Airship Graveyard .. you might want to spend some time spamming
Black Bandits as the 10 wood + 2 ores resource is quite common and most
importantly the chance to get RARE items. I personally got 2 Giga from here.)

From lvl 50 and above Black Bandit will be less efficient
(unless you are still waiting for a RARE item).
Temple of Pyrxnn - Amraan gives better XP/Gold per AP
but the NPC Rahjarn for that particular quest is tough for lvl 45-50.
By lvl 50 u should be heading back to Imperial and do Airship Graveyard to
unlock Gates of Arcahxis (gives good XP/Gold plus a chance to ger 5 prock).

lvl 50 - 60 Gates of Arcahxis - Imperial
(unlocks nothing.. just hope u get some prock)

lvl 60 - 65 High Altitude experiment - Aeros
(unlocks Ancient Ruins of King Macuchitl ... try to travel during Travel Fair &
make sure you have enough Gold & resource to buy anything in Aeros as its
quite costly to travel to Aeros plus you can't PvP @ Mine there.. You wont be
coming back here til you're 75 to spam the Arcwhale)

lvl 65-75 Ancient Ruins of King Macuchitl - Corxas
(one of the Quest that gives the best XP/Gold per AP but beware the
NPC: Arkantar .. Escape unless you're a Fat Cow Engi or High Dam Rammer,
Gunner with updated/good canons might stand a chance too).

lvl 75-85 Track down the Arcwhale - Aeros
(Unlocked from Clear out a Giant Nautilus Nest in Corxas.... If you are feeling
lucky, you might get… random rare item and/or 10 ore)

lvl 85-99 Explore Treasure Island - Jade
(Unlocks Explore the Dark Maelstrom in Aeros.... one of the Quest that gives
the best XP/Gold per AP but beware the NPC: Carcinas... Escape unless you're
a Fat Cow Engi or High Dam Rammer, Gunner with updated/good canons
might stand a chance too)

Bear in mind what i listed is just a suggestion from my own experience.
Less travel from Port to Port
(Imperial > Jade > Amraan > Corxas > Imperial > Aeros > Corxas > Aeros >
Jade).
By level 65, if u plan to try & defeat Arkantar u shud buy necessary
parts/weapons as u travel to do Quest.

Hope that helps :-)